Blech. To start, the axle seems really far back which will make for a heavy tongue weight. The second consequence is there won't be much load on the trailer axle. With a 2000b axle and realistic load of only a few hundred pounds, the trailer suspension won't do much. I'm not saying that trailer won't work, it just looks like they focused on standing it up and didn't think much about trailer design while it was in motion.
Looks like a stinger, or a stinger knockoff to me. They are very highly regarded trailers, and the axle placement is somewhat intentional so that the rear of the motorcycle acts as part of the trailers suspension, while yes, possibly transferring some more weight to the towing vehicle which also leads to a smoother ride. With a more traditional centre mounted axle the trailer would be MUCH more bouncy in the end, and these trailers are typically built to handle large cruisers that can exceed 1000#, hence the 2000# axle. If you put a much lighter bike on it, yes, you will pay a ride penalty, but that would go with ANY trailer, and the rearward axle placement on these sorts of trailers (stinger style) helps negate that.
Lastly, with a torsion style suspension vs traditional springs, they typically ride much smoother, even when lightly loaded.
IMHO that's a heck of a deal and won't last long.
油井緋色, the only thing I would note is that it needs fenders to be legal (you stand a very good chance of getting a ticket without them, ESPECIALLY if it's raining when you're towing as it will throw rooster tails 50+ feet in the air). Any welding shop could fab up some brackets quick and put them on for you in a flash if you go buy a pair of metal ones and bring them to the shop with you, along with the trailer. Ask to see the lights working as well unless you're savvy with electrical...although it's not complicated stuff if you're handy at all. I'd also add some reflectors on the sides of the trailer as there are no clearance lights - by the letter of the law there probably should be 1 amber one on either side of the front/tongue area, FWIW, but I doubt you'd get a cop that would nail you for it...but for safety, adding a few or sticking on a bunch of highly reflective tape would be wise. As I've mentioned in a few other threads I have a bunch of the highway-quality 3M reflective material you're welcome to if you want, it would serve the purpose of making you seen.
Personally, if I only needed a 1 bike trailer I'd be all over that like a fat kid on a Smartie. It won't last long.